21904205270 has 16 divisors (see below), whose sum is σ = 39715364448. Its totient is φ = 8697727680.

The previous prime is 21904205251. The next prime is 21904205291. The reversal of 21904205270 is 7250240912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7992866 + ... + 7995605.

It is an arithmetic number, because the mean of its divisors is an integer number (2482210278).

Almost surely, 2^21904205270 is an apocalyptic number.

21904205270 is a deficient number, since it is larger than the sum of its proper divisors (17811159178).

21904205270 is a wasteful number, since it uses less digits than its factorization.

21904205270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15988615.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21904205270 in words is "twenty-one billion, nine hundred four million, two hundred five thousand, two hundred seventy".